I agree that pi is probably the mathematical symbol... Christina Rossetti - The Goblin Market? That's what comes to my mind when I think of her.

Rose Tyler will trade places with a pop singer - I thought she wasn't back til the episode after this? Maybe there's a pop singer on Midnight that looks like her, (Or maybe they're big fans of Billie Piper, lol)

On this site's page for Midnight, "Rafaella Carra (Italian singer) appears "in all her glory" as part of the in-shuttle entertainment package" is mentioned, and not as a hint, from someone that has actually seen the episode.

I think this person most likely appears as a hologram- she's Italian, so who's to say the production team didn't get some footage of her while they were filming at Cinecitta in Italy for Pompeii? It makes sense.

That hologram is disrupted very briefly (probably while the Doctor has his back turned to the hologram - it seems very likely to be a cue for him and some other character to have an important discussion - with an image of Rose.

My theory about Rose thing is that the Doctor will watch her singing and do another "Flashback" thing, like in 'The Runaway Bride' where he sees someone dancing and thinks it is Rose. Rafaella Cara looks a bit like Rose, enough for this to make sense. However, Twood's hologram theory makes sense too. If he misses her when she shouts 'DOCTOR!' I may scream.

Also, I'm worried about the phrase "characters tells the Time Lord" Why not say "The Doctor"? Is it crazy to suggest that it could be the Master, also on the ship, masquerading as the Doctor, but unseen by him? Before this season I wouldn't have believed it, but I would not be surprised if they had a sweeping shot showing Simms as the Master and then they don't show him for a while after that. (next season or whatever)

Daystardragon, that is also a very good idea... after seeing pictures of Rafaella Cara, I can definitely see that happening. RTD might be combining elements from two of the Christmas specials here... :)

Betty Boop is definitely a herring. This is the low-budget episode (or so it is rumoured), so getting permission to use the character would be likely an astronomical amount of money for a TV program and a low-budget episode. (Granted, there has been a running theme of cartoons in Series 4, but that is just ridiculous.)

The Lost Moon of Poosh: Why not? Only one that hasn't been seen/lined up to be seen... perhaps the Professor knows a bit about the Lost Moon and why it is lost... (I have my own speculations on the subject)

In brief, the Medusa Cascade is a planet, yes, but one with a rift that has the ability to turn planets to stone. (Hence the Medusa part of its name). It was sealed by the Doctor, and this was obviously a big thing as it was mentioned by the Master. As of late, however, the rift has become active again... and the Doctor doesn't know.

The Adiposian Breeding Planet, Pyrovillia, and other planets have been turned to stone, therefore. When the Doctor mentions the 15th broken moon in TSS, he likely still believes the Cascade has become a peculiar tourist attraction, with some of its planets cracking (hence the broken stone moon).

I also believe that, to make sure that all the kid viewers were familiar in some part with Medusa and the Gorgons' power to turn things to stone, he deliberately requested there be a story about Gorgons in SJA so that kids could have some knowledge of Medusa, etc. and not have to go through a history lesson, wasting plot minutes.

Arcadia: There was a Fall there, and it was in one of the New Adventures books... could there be some political unrest there (I haven't read the book myself, so I'm not sure)

Pi: If it's numerical, then maybe. I don't know.

Handsome Comment: Likely.

Professor Bomb: Judging by the fact that this episode leads its characters to do and say some terrible things, perhaps the Professor has become tired of all he's seen... or is that way too dark for DW? Torchwood, probably, but DW?

Christina Rossetti: Only one I can think of is Goblin Market... and that's about two sisters, each tempted by evil but one, I think, is resolute... perhaps Sky and another woman are both offered/forced possession, and Sky submits?

Sinister Shadow: Most likely spotted on the radar.

French Phrase: Could be allons-y, could be deja vu (as !rich! as suggested). Again, likely.

I have an idea about the french phrase and Rose trading places with a pop singer. Could the song be "Je Ne Sais Pas Pourquoi", and the singer being replaced by Rose being Kylie Minogue? This would solve both of those and is quite feasible seeing RTD's love for Kylie and 2oth century dance music. This would also make Billie Piper happy as she was annoyed about not being in "Voyage Of The Damned", as she wanted to meet Kylie. Well its a thought, anyway......

refering to what someone said about a hologram being replaced by Rose and The Doctor not seeong it what if he does. The bit in the cinema trailer were he looks shocked could be when he sees Rose. (Robin)

Anonymous (that person that made the hologram comment was me), you have a good idea, but it lessens the emotional impact when the Doctor DOES see Rose in Episode 12. Check the filming reports for that episode on here; you'll see what I mean.

I think that is far more likely a scene of the Doctor staring at something in utter despair, quite possibly a shadow or something (as hypothesized by the hints).

But you never know.

Shaun, it's not going to be the Macra. Macra do not possess people. I suspect it'll be some sort of psychic beast that can possess people (like Sky).

And Kylie in Midnight? Doubtful, considering Rafaella Cara, an Italian singer, has already been confirmed as part of the entertainment package. To throw Kylie in just to please ONE person would be ill-advised on RTD's part. Even if that person is Billie Piper.

Now this is where it gets interesting. the Nightingale could be Rose, taking place of the singer. Nightingales are symbols of, among other melancholy things, loss of love. (Rose, Duh) And of course, Sky is there.

I don't think it's nessicarily true, but that is a pretty cool thought. And a nice ping back to those old cliffhangers where the Master's just chilling out, laughing evily to himself while the Doctor's in mortal peril.

I keep picturing Simms growing a little soul patch, now, though. Just because the Doctor reacting to that would be hilarious.

"One of the characters tells the Time Lord: "Oh Doctor, you're so handsome." He agrees."

Exactly the same scene was in "Casanova", written by RTD, played by DT. I'd say it is not true. Could be a reference though.

Maybe Donna sees (or was distracted and missed) Rose interfering with hologram at spa? Remember, both Rose appearances was missed by Donna, while Doctor was nowhere near. Maybe it has something to do with Donna "missing the big picture", like in "Runaway Bride".

I get the impression that this is going to be a bit of a sleepy episode. Several of the previous series have a sort of calm before the storm - Blink was a great episode but didn't lead into Utopia at all, it stood alone as far as I recall.

REMEMBER me when I am gone away, Gone far away into the silent land; When you can no more hold me by the hand, Nor I half turn to go, yet turning stay. Remember me when no more day by day You tell me of our future that you plann'd: Only remember me; you understand It will be late to counsel then or pray. Yet if you should forget me for a while And afterwards remember, do not grieve: For if the darkness and corruption leave A vestige of the thoughts that once I had, Better by far you should forget and smile Than that you should remember and be sad.

Anonymous: I saw that poem too, and I thought this line: "Nor I half turn to go, yet turning stay" was particularly relevant. Gosh, I wonder which direction that half-turn might be in...

Then again, it also says "famous poem," and the one people seem to know is "Goblin Market." There doesn't seem to be much literal connection, but there's definitely a thematic one: a young woman has a single, brief taste of wonderful, one-of-a-kind fruits, but then is wasting away when she can't experience that wonder again. Sounds more than a bit like the kind of things we've heard said by former companions (Sarah Jane especially), and the kind of thing that prompted Donna to search for the Doctor in "Partners in Crime."

Also, when do we predict "Whatever happens, Rose is coming back. Isn't that good?" will be said? If it is put in this episode then Donna would have to have at least a bit of a conversation. Then again, she might just see rose, who sees her and says something along the lines of, "I'm coming back" before she vanishes. Then Donna tells the Doctor about "That strange lady, the blonde I told about the Car Keys, said she wuz coming back and then she vanished." Doctor: "Blonde? was she [describes Rose/shows picture]?"Donna: "Yes."Doctor: :)

Ok, here's a thought. Do I believe RS is Rose, yes. Could I be wrong, of course.

Here's my theory:

How is it possible that Rose wasn't fundamentally changed when she absorbed the time vortex. First of all, we are talking about a very old and very powerful energy. Secondly, she brought immortal life to Jack with just a touch of that power, so, it must have affected her physiology.

Moving on, The Doctor makes references in Jon Pertwee's era and later on that the Timelords were much like humans until the harnessed the power of a blackhole. Until that point, Timelords didn't regenerate. When Rass, Omega and The Other harnessed the power of a collapsed star (The Eye of Harmony) then the people of Gallifrey became the Timelords we know and love today.

Think about, Rose absorbed all that power. It changed the physiology of the Timelords; therefore, it quite possibly changed Rose's physiology as well. Not to mention all the coincidences that tie RS and Rose together, as previously mentioned by another blogger.